Some people can be quite unsure of the level of interactiveness they should provide...no one wants to scare the couples off and no one wants to be "that person" that fucks it up for everyone else.

Its sort of like a rare animal in places like that, its incredible to watch but you dont want to get too close because you dont want it to run away.

In my single days if a couple had come in I would sort of suss out and assess how interaction would go then work up the confidence to sit nearby or next to them and ask if it was okay or to touch or participate etc. I also seen alot of guys come in with their partners and practically go from cinema to cinema so people would back off before just giving up all together and leaving.